Emission electrode system for electrostatic precipitators



A. HAGLUND ETAL 3,203,155

EMISSION ELECTRODE SYSTEM FOR ELECTROSTATIC PRECIPITATORS Aug 31, 1965 Filed April 21' 1962.

FIGI.

ATTYS.

United States Patent 3,203,155 EMISSION ELECTRODE SYSTEM FOR ELECTRO- STATKC PRECIPETATORS Algot Haglund, Jonkoping, and Giista Mildh, Vattersnas,

Sweden, assignors to Alrtiebolaget Svenska Fiaktfabriken, Stockholm, Sweden Filed Apr. 2, 1962, Ser. No. 184,834 2 Claims. (Cl. 55-148) The present invent-ion relates to an arrangement in emission electrode system for electrostatic precipitators consisting of a rectangular frame anda number of ribbon-type electrodes parallelly fixed between two opposite sides of the frame. In electrostatic precipitatots of this type there is a demand of getting a joining as firm as possible between frame and electrodes. The joining should further admit an easy mounting and-when exchange of single electrodes is required-also dismounting.

Earlier known types of interchangeable electrodes have had the disadvantage that an insuflicient contact pressure has been obtained between electrodes and frame resulting in heavy current peaks. At the points of repeated flashovers the electrodes have, under certain physical condi tions, been destroyed by corrosion. It is an object of the invention to provide a rigid emission electrode system and eliminate said drawbacks. The invention is characterized by the fact that the ribbon electrodes are slightly wavy so as to obtain the desired elasticity and made with circularly bent ends adapted to be inserted into sockets, attached to the frame at a right angle to the same and provided with a slot pointed towards the center of the frame, and that said sockets are made with a length somewhat smaller than the width of the ribbon electrodes to make it possible to lock the ribbon electrodes in the sockets by flaring or joggling the edges of the circularly bent ends.

The invention will now be described with reference to the accompanying drawing showing an exemplifying embodiment of an emission electrode system in accordance with the invention and where FIG. 1 shows a side-view of an emission electrode in an electrostatic prec-ipitator, the view being taken on the line 1-1 of FIG. 2;

FIG. 2 is a cross-section along the line 2-2 in FIG. 1;

FIG. 3 is a transverse section taken on the line 3-3 of FIG. 1;

FIG. 4 is a view like FIG. 3 but showing the parts before the tubular ends of the electrode have been expanded;

FIG. 5 is a View like FIG. 2 but taken before the electrode is connected at one end.

In the accompanying drawing 1 designates a part, such as a bar, of -a rectangular frame in an electrostatic precipitator. 2 designates one of a suitable number of electrodes, attached between the spaced bars of two opposite sides of the frame. As shown in FIG. 1 the ribbon electrodes 2 are slightly wavy to obtain desired elasticity and are further made with circularly bent tubular ends 3. These tubular ends are, in accordance with the invention, adapted to be inserted into tubular bores of socket members 4, attached to the frame bars 1, for instance by welding, and disposed at a right angle to the frame bars 1. The socket members are provided with a slot 5 pointed towards the center of the frame and made with a length a somewhat smaller than the width b of the ribbon electrode to make it possible to lock the ribbon electrodes in the sockets by flaring or joggling the edges 6 of the circularly bent ends according to the invention. Hereby ,a sufficient contact pressure between electrodes and frame is secured. This flaring or joggling is made with a suitable tool after the "Ice ribbon electrode has been mounted in its place in the socket.

As is apparent from the drawing, the tubular end portions of the electrode 2 may be inserted into the sockets by passing the end portion axially through the socket with the ribbon electrode passing through the slot.

What we claim is:

1. An emisson electrode system for electrostatic precipitators comprising two spaced apart parallel electrode-supporting bars disposed in substantially the same vertical plane, at least one socket member fixedly secured to each of said bars, the socket member on one of said bars being disposed opposite to and spaced substantially vertically from the socket member on the other of said bars, each of said socket members having a tubular bore therethrough and a narrow slot extending along the length thereof and intersecting said bore, the bores of said opposite socket members being parallel and the slots opening toward one another in confronting relationship; and a wavy ribbon electrode extending between said opposite socket members and having integral bent tubular end elements mounted in said tubular bores with the ribbon electrode passing through said slots, said tubular end elements of the ribbon electrode being axially longer than the length of the bores of said socket members and projecting from both ends of said socket members, the projecting ends of said tubular end elements being flared into firm contact against opposite ends of said socket to tightly secure said end elements in said socket bores and establish firm electrical joint connections between said ribbon electrode and said socket members.

2. An emission electrode system according to claim 4 wherein the bores and slots of said socket members are disposed transversely of the spaced supporting bars whereby the ribbon electrode supported therebetween is disposed transversely to the plane defined by said supporting bars.

References Cited by the Examiner UNITED STATES PATENTS 670,894 3/01 Emery.

737,062 8/03 Bennett.

791,332 5/05 Duval.

947,011 1/10 Brown 24-256 1,219,179 -3/ l7 Smith. 1,332,510 3/20 Meston 55-147 XR 2,164,628 7/39 Sibley -173 XR 2,362,716 1 1/ 44 Philips 55-146 2,508,133 5/50 Anderson 55-147 XR 2,532,734 '12/50 Schmidt 55-148 2,537,024 1/5-1 Bay 165-173 XR 2,628,861 2/53 Greig 24-256 XR 2,684,730 7/54 Schlman 55-150 XR 2,708,488 5/55 Larsson 55-151 2,812,035 11/57 Schlman et al 55-130 XR 2,852,093 9/58 Streuber 55-141 2,866,517 12/58 Phyl 55-150 XR 2,898,438 8/59 Gibson 55-154 XR FOREIGN PATENTS 694,603 9/30 France.

1,184,046 2/59 France.

93,704 3/ 60 Netherlands.

HARRY B. THORNTON, Primary Examiner.

REUBEN FRIEDMAN, ROBERT E. BURNETT,

Examiners. 

1. AN EMISSION ELECTRODE SYSTEM FOR ELECTROSTATIC PRECIPITATOR COMPRISING TWO SPACED APART PARALLEL ELECTRODE-SUPPORTING BARS DISPOSED IN SUBSTANTIALLY THE SAME VERTICAL PLANE, AT LEAST ONE SOCKET MEMBER FIXEDLY SECURED TO EACH OF SAID BARS, THE SOCKET MEMBER ON ONE OF SAID BARS BEING DISPOSED OPPOSITE TO AND SPACED SUBSTANTIALLY VERTICALLY FROM THE SOCKET MEMBER ON THE OTHER OF SAID BARS, EACH OF SAID SOCKET MEMBERS HAVING A TUBULAR BORE THERETHROUGH AND A NARROW SLOT EXTENDING ALONG THE LENGTH THEREOF AND INTERSECTING SAID BOAR, THE BORES OF SAID OPPOSITE SOCKET MEMBERS BEING PARALLEL AND THE SLOTS OPENING TOWARD ONE ANOTHER IN CONFRONTING RELATIONSHIP; AND A WAVY RIBBON ELECTRODE EXTENDING BETWEEN SAID OPPOSITE SOCKET MEMBERS AND HAVING INTEGRAL BENT TUBULAR END ELEMENTS MOUNTED IN SAID TUBULAR BORES WITH THE RIBBON ELECTRODES PASSING THROUGH SAID SLOTS, SAID TUBULAR END ELEMENTS OF THE RIBBON ELECTRODE BEING AXIALLY LONGER THAN THE LENGTH OF THE BORES OF SAID SOCKET MEMBERS AND PROJECTING FROM 